J2ME在移动设备上实现动画程序方法
public Display getDisplay(){; return display; };
// Initialize things by creating the canvas and then
// creating a series of birds that are moved to
// random locations on the canvas and attached to
// a timer for scheduling.
protected void initMIDlet(){;
try {;
AnimatedCanvas c = new
AnimatedCanvas( getDisplay() );
Image[] images =loadFrames( "/images/bird", BIRD_FRAMES );
int w = c.getWidth();
int h = c.getHeight();
birds = new AnimatedImage[ NUM_BIRDS ];
for( int i = 0; i < NUM_BIRDS; i ){;
AnimatedImage b = new
AnimatedImage( c, images );
birds = b;
b.move( genRandom( w ), genRandom( h ) );
c.add( b );
timer.schedule( b, genRandom( 1000 ),genRandom( 400 ) );
};
c.addCommand( exitCommand );
c.setCommandListener( this );
getDisplay().setCurrent( c );
};
catch( IOException e ){;
System.out.println( "Could not load images" );
exitMIDlet();
};
};
// Load the bird animation, which is stored as a
// series of PNG files in the MIDlet suite.
private Image[] loadFrames( String name, int frames )
throws IOException {;
Image[] images = new Image[frames];
for( int i = 0; i < frames; i ){;
images = Image.createImage( name i ".png" );
};
return images;
};
protected void pauseApp(){; };
protected void startApp()
throws MIDletStateChangeException {;
if( display == null ){;
display = Display.getDisplay( this );
initMIDlet();
};
};
};
七帧图片的动画，你可以看到一个拍着翅膀的小鸟。MIDlet显示了5只小鸟，小鸟的位置和刷新速度是随机的。你可以用一些其他的办法来改进这个程序，但这个程序也应该足够能让你上手了。
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